//Released under the MIT License.
//
//Copyright (c) 2015 Ntreev Soft co., Ltd.
//
//Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated 
//documentation files (the "Software"), to deal in the Software without restriction, including without limitation the 
//rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit 
//persons to whom the Software is furnished to do so, subject to the following conditions:
//
//The above copyright notice and this permission notice shall be included in all copies or substantial portions of the 
//Software.
//
//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
//WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR 
//COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
//OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Ntreev.Library.Psd.Readers.LayerAndMaskInformation
{
    class ChannelsBlock : LazyDataReader
    {
      private Channel[] channels;

      public ChannelsBlock(PsdReader reader, long length, PsdLayer layer)
        {
          Init(reader, length, layer);
        }

      public Channel[] Channels
      {
        get
        {
          ReadData();
          return channels;
        }

        set
        {
          channels = value;
        }
      }

      protected override void ReadData(PsdReader reader, object userData)
        {
            PsdLayer layer = userData as PsdLayer;
            LayerRecords records = layer.Records;

            using (MemoryStream stream = new MemoryStream(reader.ReadBytes((int)this.Length)))
            using (PsdReader r = new PsdReader(stream, reader.Resolver, reader.Uri))
            {
                r.Version = reader.Version;
                this.ReadValue(r, layer.Depth, records.Channels);
            }

          Channels = records.Channels;
        }

        private void ReadValue(PsdReader reader, int depth, Channel[] channels)
        {
            foreach (var item in channels)
            {
                CompressionType compressionType = reader.ReadCompressionType();
                item.ReadHeader(reader, compressionType);
                item.Read(reader, depth, compressionType);
            }
        }
    }
}
